Presser-foot lifting and locking mechanism for sewing-machines.



Patented Deo.9,` |902. H. A. K-LEMM. y PBESSER FO0T LIFTING AND LOCKING MECHANISM .FUR SEWING MACHINES.

(Application led Nov. 22, 1901.)

(No Modell) EIGJ..

vUNITED STATES PATENT OEEICE.

HERMANN A. KLEMM, OF NEW YORK, N. Y. j

PRESSER-FOOT LIFTING AND LOCKING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of LettersPatent No. 715,669, dated December 9, 1902.

l Application tiled November 22, 1901. Serial No. 83,220. KNO model.)

To all whom 15m/cry concern:

Be it known that I, HERMANN A. KLEMM, a citizen of the United States of America,and a resident of New York city, county and State of New York, have invented certain new and useful Improvements in Presser-Foot Lifting andLockingll/lechanism for Sewing-Machines, of which thefollowing is a specification.

My invention is in this example shown in connection with means for lifting the presserfoot'by a foot-treadle to enable the operator to have both hands free for adjusting the fabric and holding it until secured by the grip of the presser-foot; and it consists of means for utilizing the guide-arm for the presser,

also used in this case as part of said lifting device, in an improved automatic locking device in machines in which the lockingthread looper reciprocates over the presserfoot to prevent lifting the presser-foot or letting it down at any time when the looper occupies a position in which the presser-foot will collide with it in shifting either way to prevent damage to the looper, as hereinafter described, reference being made to the accompanying drawings, in which- Figure l is a front elevation of parts of an overedge sewingmachine, in which my present improvements are represented, with some arts of the machine in vertical section parallel with the plane of the front view. Fig. 2 is an end elevation of the principal parts represented in Fig. l, with the throat-plate in section. Fig. 3 is a detail in horizontal section on line l l of Fig. 1. i

A represents the presser-bar, b the presserfoot, c the looper, and ol the hook, which with their operating mechanisms constitute the essential features of an overedge sewing-machine. In the operation of such machines and sewing-machines generally it is `sometimes very essential that both hands be employed in adjusting the work to the needle while the presser-foot is up, and it is difficult to retain the Work With one hand while releasing the other hand to let the presser-foot down.

On the rear side of the clamp-stud e, attached to the presser-bar A for running in the guide-slot f to maintain the presser-foot in the feed-line, I provide the rearwardlyprojecting arm g, reaching through a slot h in the head 'i of the supporting-arm j of the l der the extremity of arm g at m, and the.

other end' is connected by a rod 'n to a foot treadle o, located suitably for the operator to lift the presser by his foot. A springp raises the treadle and releases the lever k from arm g, when the presser-foot is let down. The usual presser-spring will be employed for causing the grip of the presser on the fabric being sewed, and the usual presser-lifting cam-lever q may also be employed for so lift ing the presser when desired and for locking the presser in the uplifted position, which is sometimes required. Thus it will be seen that a more convenient means of manipulating the presser generally is provided, besides enabling greater facility in holding the fabric until secured by the presser-foot. Thus having the arm g for lifting the presser by the lever le I now propose to utilize it in such machines as have a looper c, that ranges over the presser-foot in its operation, as part of an automatic locking device to prevent raising the presser-foot or letting it down While the looper is in such position that the presserfoot would collide with and damage thelooper, and to this end I employ the reciprocating rod s, operated by the lever t, by which the looper c is operated, so that it is shifted forward synchronously with 'the forward movement of the looper, and on this rod I provide a prong u, which ranges over said arm g, while the looper ranges over the presser-foot, and

thus prevents lifting the presser-foot during such time, and said prong also ranges under said arm when the presser is held up by cam q and prevents dropping the presser onto the looper.

Suitable free space is provided between the upper side of arm g and the lower side of prong u to avoid hindrance to the necessary vertical play of lthe presser-foot through the lifting caused by the vertical movement of the feed-dog, and there is like space between the under side of said arm and the upper side of lever lc, where it acts against said arm, to`

avoid obstruction to the proper descent'of the presser-foot when the feeddog descends. An essential advantage 'of this improved Ifo presser barlooking apparatus is that the Il the looper, a part of which rod automatically presser cannot be lifted in any Way by hand i arrests and holds said arm While the looper when the bar is locked, as it can be When it i ranges over or under the presser-foot, to preis only the presser-liftingz,r cam-lever that is Vent lifting or dropping the presser-foot dur- 5 locked, and thus another element of danger l ing such times.

Signed at New York eity this lil-th day of November, 1901.

HERMANN A. KLEMM.

to the looper is avoided.

Vhat I claim as my invention is The combination with the presser-bar, the lateral arm of said bar employed for lifting lo the presser-foot, and With the looper, of the reciprocating rod Working synchronously with W tnesses:

C. SEDG-WIOK, A. l). THAYER. 

